What are the main differences between the various types of couverture chocolate?

All you need to know about Valrhona Couverture Chocolates

The name “couverture chocolate” is generally used to refer to the chocolate material worked by artisans or restaurateurs when creating their recipes. 
For professionals, you can find couverture chocolates in the shape of pistoles, bars or blocks. 

The different types of chocolate

We can classify couverture chocolates according to their color (dark, white, milk) or composition (Marriage of Grands Crus, Pure Origin). 
As the percentage of cocoa plays a determining role in the use of a certain type of chocolate, either as part of a tasting or an ingredient, this distinction can also be made on this basis, as well as on the taste attributes of the chocolate, depending on the desired effect.